Shelf



FIG. 1 is a top perspective view of the design of a shelf;

FIG. 2 is a top plan view of the shelf shown in FIG. 1

FIG. 3 is a bottom side view of the shelf shown in FIG. 1;

FIG. 4 is a front side view of the shelf shown in FIG. 1;

FIG. 5 is a right side view of the shelf shown in FIG. 1; and,

FIG. 6 is a top perspective view of a shelving unit including shelf shown in FIG. 1.

Any features shown in broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a shelf, as shown and described. 